Infinity Primus 2-WAY P252 Dual 5.25 Floor Spk Frequency Response (3dB): 49Hz - 20kHz Recommended Power Amplifier Range: 10 - 150 Watts Crossover Frequency(ies): 2,500Hz; 24dB/octave Dimensions (HWD): 35-3/4 X 7-3/8 X 11-3/4 In.